title: Birth order, sibship size, and housing density in relation to tooth loss and periodontal disease: a cohort study among Swedish twins.
mesh_terms: D000328:Adult; D000368:Aged; D001722:Birth Order; D015331:Cohort Studies; D005260:Female; D006798:Housing; D006801:Humans; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D010510:Periodontal Diseases / Q000453:epidemiology* / Q000209:etiology; D012042:Registries; D035781:Siblings; D013548:Sweden / Q000453:epidemiology; D016388:Tooth Loss / Q000453:epidemiology / Q000209:etiology; D014427:Twins